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\ 2 Ilk 91 A www energylab com Helena MT 877- 472 -0711 ' Billings, MT 800- 735 -4489 • Casper, WY 888- 235 -0515 <br />Analytical Excellence Since 1952 Gillette, WY 866 -686 -7175 ' Rapid City, SD 888 - 672 -1225 • College Station, 7X 888 - 690 -2218 <br />QA /QC Summary Report <br />Prepared by Casper, WY Branch <br />Client: O'Connor Design Inc <br />Project: CM -25 <br />Analyte <br />Method: RA -05 <br />Sample ID: LCS -33625 <br />Radium 228 <br />Sample ID: MB -33625 <br />Radium 228 <br />Radium 228 precision (3) <br />Radium 228 MDC <br />Sample ID: C12050464- 001AMS <br />Radium 228 <br />Sample ID: C12050464- 001AMSD <br />Radium 228 <br />Count Result Units <br />Laboratory Control Sample <br />10 7 <br />pCi /L <br />3 Method Blank <br />007 <br />pCi /L <br />1 <br />pCi /L <br />2 <br />pCdL <br />Sample Matrix Spike <br />59.9 <br />pCi /L <br />Sample Matrix Spike Duplicate <br />574 <br />pCi /L <br />Qualifiers: <br />-1 - Analyte reporting limit <br />DC - Minimum detectable concentration <br />Report Date: 06/18/12 <br />Work Order: C12050462 <br />RL %REC Low Limit High Limit RPD RPDLimit Clual <br />Batch 33625 <br />Run TENNELEC- 3_120605A 06/12/1211:00 <br />88 80 120 <br />Run TENNELEC- 3_120605A 06112/1211:00 <br />U <br />Run TENNELEC- 3_120605A 06112/1211 00 <br />106 70 130 <br />Run TENNELEC- 3_120605A 06/12/121100 <br />98 70 130 4.4 388 <br />ND - Not detected at the reporting limit. <br />U - Not detected at minimum detectable concentration <br />